pbratios: Processing Pb isotope ratio data

#' Raw csv report with Pb isotope ratio data.
#'
#' This raw report was obtained saving as .csv the original .rep file produced by the mass
#' spectrometer Perkin Elmer ELAN ICP-MS. This file is an example of \bold{long} report.
#'
#' Field separator are "," and decimal separator are ".". Standards with known Pb isotope ratios are
#' used to correct the instrumental mass bias by the bracketing standard technique and are labelled
#' as \code{SRM}. QC data are BCR CRM 482 and are labelled as \code{CRM}. Sample data refer to
#' marine particulate matter collected in the coastal marine enviroment of Kongsfjorden (Svalbards,
#' Norvegian Arctic) in 2012.
#'
#' @name spmnya_2012
#'
#' @format The file has 5110 rows and 7 columns.
#'
#' @author Andrea Bazzano and Marco Grotti.
#'
#' @source Processed data were published in Bazzano, Rivaro, Soggia, Ardini and Grotti,
#'   Anthropogenic and natural sources of particulate trace elements in the coastal marine
#'   environment of Kongsfjorden, Svalbard. Marine Chemistry, 2014, 163, 28-35.
#'
#' @examples
#' file.long <- system.file("extdata", "spmnya_2012.csv", package = "pbratios")
#' spmnya.2012 <- extract_data(file.long, report = "long")
#'
#' @seealso \code{\link{extract_data}}
#'
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